Knockout for die casting machines



Aug. 26, 1941. L RING I2,253,651

xN'oQKoUT For; DIE CASTING MACHINES Fixed May 17', 1940 2 sheets-sheet 1T7511@ f 4 2" 9 g lue 4 f6 v Il j. I: l ."llf

Aug. 26, 1941.l L RING 2,253,651

xNocKoUT FOR DIE CASTING MACHINES Filed May 17, 1940 2 Sheets-SheetI 2 dnuentor :w f' Gttornegs Patented A118 26i 1941 j t i AuNiTi-:D STATEKNOCKQUT FOR- s PATENTy oFFglcE Lucian Ring, Detroit, Mich., assignor toTernstedt Manufacturing Company. Detroit, Mich., acorporation ofMichigan Application May 17, 1940, Serial No. 335,827

A solaire.. This invention relates to the art of die casting and more.particularly to an improvedv ejectorand knock-out mechanism for freeingthe fini'shed casting from the die.

In the operating cycle of die casting machines in ,general use, the diesare closed, then molten metal is injected into the die cavity andfreezes,

the dies are -opened and the finished casting is ejected from the diecavity. Where necessary the operating cycle also includes the'projection The invention may be incorporated invarious types .of wellknown die casting machines and is especially adapted ifor use withrelatively movable dies having a vertical parting line as shown.

into and subsequent retraction from the die cavity of one or more cores.In the separation of the dies the casting sticks to the cooler diesurface but lthe bond is broken by the action of the ejector. However,the casting also sticks to the surface of the ejector exposedin the diecavity during the casting operation and needs to be removed manuallyafter beingv ejected from the die. This manual removal is performed bythe workman' after the completion of each operating cycle and accordingto usual practice the workman with a pair of long handled pliers stepsup to the parted dies .and with proper caution inserts the pliers,takes' hold vof the hot casting, dislodges it from the ejector and liftsit out andy deposits it in a suitable receptacle.-

It is an object of the present invention to elim- I inate the manualoperation of removing the'nished 4casting and thereby reduce the hazard,ef-

fort and timer involved by providing mechanism not only to eject thefinished casting but to free it completely so that it drops.automatically from the machine at the end of the cycle andenables thenext casting operation to proceed without delay. Y I i A further objectof the invention is. to provide a mechanical 'knock-out deviceoperatively connected with the cooperating vdie blockslforfactuationupon relative die movement to project a member between the separateddies and behind the ejected castings and impart a nal lateral movementto the member to strike or push against the casting and break it loosefrom the ejector.

Other objects and advantages will becomes ap- `,parent-during lthecourse of the following specification having reference c to theaccompanying drawings wherein Figure l is a side elevation of a fragmentlof a die casting machine having the invention applied thereto; Figure 2is an enlarged view, partly in section,`showing the relation of theparts', with the dies in closed position; Figurel 3'illustratesftherelation of the 'par-ts'with .thedies in'fullyl opened position andFigure 4 is a sectional view taken on line l-l of Figure 2.

' metal is injected into the cavity and the dies for example, in UnitedStates Patent No. 2,145,- 956 tc Stern. As illustrated in the drawingssuch machine consists essentially of a vin vable die block I and astationary die block 2,2 the latter having a sprue opening for receivingmolten metal from the nozzle 3 of the injection mechanism associatedwith a melting pot. jlhel stationary die block 2 is bolted rigidly'to anupright or standard 4 projecting upwardly from the frame of the machineand the movable die block I is mounted on reciprocatory carriage 5slidably supported on a series of horizontal guide rods 6 'fastened atopposite ends in the upright v4 and a similar frame upright 1. Suitableloperating mechanism for the carriage 5, such asa piston motor, isconnected to the c arriage by -type of die cavity and the shape to becastland,

that the ejector nose lllustrated'is that usually employed when the dieis formed with multiple cavities. The remote end of the ejector 9 isconnected with suitable operating mechanism, such as a piston motorindicated at Il.

The actuation of the ejector, the .die carriage and the metal injectingmechanism are automatically controlled for actiony in timed sequence.After the dies have been closedv the then are movedto open position, thefinished castingbeing carried away in the movable die. Asthe parting ofthe dies is inprogress the ejector pin ,9 moves forward and pushes the fca sting out of the die cavity'with the casting remaining suspended andbonded thereon. Ac-' cording to the present invention automatic actingmeans is added to the machine to' engage the ejected casting and breakit loose from the ejector surface. This enables the finished casting -todrop from between .the parted dies so 'that the casting cycle may beagain set in motion without delay. The nished casting falling from thedie drop into a suitable receiver which, as indicatecfln thev drawings,may consist of an inclined chute I2 on which the castings slide lat--erally from the machine. Optionally an endless conveyor belt may beprovided to catch the dislodged castings and carry them from thema-vchine. Where quenching is desired the chute may lead to a suitable tankfrom which the castings are conveyed to the next operation.

The knock-out member illustrated in the drawings includes areciprocating rod I3 located wholly beyond the diesduring the castingoperation. It a is mounted in. a suitable guide block assembly Ilsupported on one of the lateral faces of the movable die block I. Theguide block Il also carries a bearing shaft I6 for a pair of gears I6and II arranged side by side and keyed or pinned together for unisonrotation. The teeth of the gear I8 are in mesh with mating teeth on theknockout rod I3 while the gear IT is engaged by a reciprocating rack I8guided in a slot in the block I4 and secured at .its end to a bracket I9on the stationary frame upright 4. Through this operating connectionrelative motion of the dies is transmitted to the knock-out rod I3 andas the dies are separated ther beveled nose 20 on the inner end of therod I3 is projected into the space between the dies for engagement withthe ejected casting.

In the initial engagementr the projectedA end 20 is located behind theejected casting, as indicated by the broken lines in Figure 3. Thestraightlineimotion of the rod I3 is effected by its bearing engagementin the slot of the guide block I4 together with the spring pressedfollower 2I,

.as seen particularly in Figure 2. This guide slot f is relieved orenlarged at opposite ends, the en-4 the guideblock I4. The camming'abutment 23 being in the path of the abutment 22 upon inthe ejector.

from/the parting line for inspection and handling of the parts as wasnecessary heretofore.

I claim:

. 1. For use .out of the cavity, means to separate the casting from theejector mechanism including a rack bar fixed to one of said parts, apair of intercom' nected gears rotatably carried by the other of saidlseparable parts with one of the gears engaged by said. rack b'ar forrotation incident to relative movement of said parts,va reciprocatorybar having rack teeth engaging the other of said gears andbeing arrangedfor projection behind an ejected'V casting and guide means for the lastmentioned bar arranged to cant the bar near its limit of travel forstriking the casting loose from 2. A die casting'machine'having incombination with separable dies and an ejector device tomove a castingout of the die cavity, of a knock-"out lever for projection behind andstriking engagement with the ejected casting, guide meanscarried-fbyfone of the dies for mounting said lever .'and motiontransmitting gearing operatively connecting said lever with the otherdie for moving said leverco-incidentally `with relative die movement. r

3. A die casting machine having in combination with separable dies andan ejector device to movea casting out of the die cavity, of a knockoutmember to be projectedl behind an ejected casting, guidemeans for saidmember carried lby one of the dies. operativeconnections between saidmember Aand the other die for imparting movement to the membenthroughrelative die movement, Iand camming abutments on the guide and memberrespectively, adapted for engagement in the projected position of themember to cant the member into striking engagement with the casting.

4. In a die casting machine, a pair of separable dies, an ejector topush a casting from the die cavity, a toothed rack fixed in relation toone4 of the dies, a gear element carried with the other ward projectionof the rod \I3 tilts the rod and causes the inner end 20 to exert a pushon the ejected casting and knock it loose from the ejector in the mannerillustrated in Figure 3. occursas the dies reach the end of theirparting travel, and with the casting removed the dies can be closedv atonce for the next casting operation. As the dies move toward closedposition the move'- ment is transmitted to the knock-out lever I3causing it to be retracted beyond the mating faces of the dies. A Inorder that the operator may remain at thecontrols at the rear of themachine, a suitable mirror or reflecting surface can be positioned op-.posite the parting line and at proper angle to enrable the operator tosee between the dies when knock-out action without leaving the controlsta-l tion. and there is eliminated the walking to and This 'dies toopen an die in mesh with said rack, a second gear element driveconnected with the first gear element and a slidable rack in meshl withthe second gear element and arranged for projection into the spacebetween the dies upondie separation to engage an ejector supportedcasting 'and break its bond to the ejector. l

5. In a diefcastingmachine, relatively movable close a die cavity, anejector associated there ith, a knock-out device to` free an ejectorsupported casting from the ejector, means carried with one of the diesto guide the knock-outdevice and means operatively connecting the otherdie and said knock-out device 4to impart motion thereto upon relativedie movenient.- I

6. In a die casting machine having relatively movable dies and anejector for pushing a completed casting out of the die cavity, aknock-out device movably mounted on one of the dies for freeing thecasting *from the ejector, motion transmittingl mechanism operativelyconnected to the other die and varranged to impart relative diemovement-to the knock-out device for the actuation thereof. 1

l 1 l LUCIAN RING.

with a diel casting machine having

